What is the LOTO procedure?

Lockout-Tagout” (padlocking) is a safety system used to prevent accidental or unauthorized start-up of an installation on which work is being carried out (e.g. electrical maintenance).

safety hasp

How does the LOTO procedure work?

 A safety hasp is usually used. This allows each person working on the equipment to attach their own padlock to the point where the isolation of the supply has been made, thus they can work in complete safety. Each padlock has a tag fixed to it which identifies the owner.

If a machine operator works on or in several areas at the same time, they must attach as many padlocks as necessary to secure the area perimeter and ensure the disconnection of all devices supplying power to the area.

Thus, power cannot be switched back on until the operator has unlocked and removed their padlocks isolating the supply.

LOTO, combining safety and time efficiency.

In a LOTO procedure, the operator shall begin by identifying all potential power sources for the concerned equipment.

The goal of this procedure is to prevent accidental start-up of a machine while it is in hazardous state or while an operator is in direct contact with it. LOTO procedures are used across industries and are regulated by law in some countries.

Save time using MARECHAL® technology

3 steps for safe maintenance.


MARECHAL ELECTRIC socket outlets allow LOTO procedures to be followed. They also allow local isolation as a default part the LOTO procedure. This can save a considerable amount of time.

How to lock out and tag out a MARECHAL® socket outlet?

The link below shows padlocking of a MARECHAL® socket outlet:


This option is available for the 90 A to 400 A DECONTACTOR™ ranges*,
a similar device is also available for the 16 A to 63 A DECONTACTOR™** range.

Summary of the video

  1. When ordering a MARECHAL® socket, add suffix 843 to the socket outlet reference, padlocking will then be fitted during manufacture.
  2. To lock out the socket, insert the locking pin into the hole below the release latch.
  3. Fix one end of the retaining cable to the pin and the other to the socket mounting screw.
  4. Lock the pin in place with a padlock or a safety hasp/padlock combination or directly through the pin hole (8 mm diameter hasp required).

NB: Padlocking also possible in the connected position

* DS6, DSHT, DS9, DS2, DS4 ranges

** DSN1, DS1, DSN3, DSN6 ranges